/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package qr_reader_logic.abhi.barcode.frag.libv2_modified;

import android.app.AlertDialog;
import android.app.Fragment;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.*;
import android.widget.FrameLayout;
import android.widget.FrameLayout.LayoutParams;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import qr_reader_logic.google.zxing.client.android_modified.*;
import qr_reader_logic.google.zxing.client.android_modified.camera.CameraConfigurationManager;
import qr_reader_logic.google.zxing.client.android_modified.camera.CameraManager;
import qr_reader_logic.google.zxing.client.android_modified.result.ResultHandlerFactory;

import java.io.IOException;
import java.util.Collection;

/**
 * This activity opens the camera and does the actual scanning on a background
 * thread. It draws a viewfinder to help the user place the barcode correctly,
 * shows feedback as the image processing is happening, and then overlays the
 * results when a scan is successful.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 * @author Abhinava Srivastava
 */
public final class BarcodeFragment extends Fragment implements
        SurfaceHolder.Callback {

    private static final String TAG = BarcodeFragment.class.getSimpleName();

    private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;

    private CameraManager cameraManager;
    private CaptureFragmentHandler handler;
    private Result savedResultToShow;
    private ViewfinderView viewfinderView;
    private boolean hasSurface;
    private Collection<BarcodeFormat> decodeFormats;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private AmbientLightManager ambientLightManager;

    public ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    public CameraManager getCameraManager() {
        return cameraManager;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        hasSurface = false;
        CameraConfigurationManager.isAlreadyInit=false;
    }

    private IScanResultHandler resultHandler;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        FrameLayout frameLayout = new FrameLayout(getActivity());
        LayoutParams layoutParams = new LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        frameLayout.setLayoutParams(layoutParams);
        surfaceView = new SurfaceView(getActivity());
        surfaceView.setLayoutParams(layoutParams);
        viewfinderView = new ViewfinderView(getActivity());
        viewfinderView.setLayoutParams(layoutParams);
        frameLayout.addView(surfaceView);
        frameLayout.addView(viewfinderView);
        inactivityTimer = new InactivityTimer(this.getActivity());
        ambientLightManager = new AmbientLightManager(this.getActivity());


        //cameraManager = new CameraManager(this.getActivity(), getView());
        return frameLayout;
    }

    public void setDecodeFor(Collection<BarcodeFormat> decodeFormat) {
        this.decodeFormats = decodeFormat;
    }

    SurfaceView surfaceView;

    @SuppressWarnings("deprecation")
    @Override
    public void onResume() {
        super.onResume();

        // CameraManager must be initialized here, not in onCreate(). This is
        // necessary because we don't
        // want to open the camera driver and measure the screen size if we're
        // going to show the help on
        // first launch. That led to bugs where the scanning rectangle was the
        // wrong size and partially
        // off screen.
        cameraManager = new CameraManager(this.getActivity(), getView());
        viewfinderView.setCameraManager(cameraManager);

        handler = null;

        resetStatusView();

        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            // The activity was paused but not stopped, so the surface still
            // exists. Therefore
            // surfaceCreated() won't be called, so init the camera here.
            initCamera(surfaceHolder);
        } else {
            // Install the callback and wait for surfaceCreated() to init the
            // camera.
            surfaceHolder.addCallback(this);
            surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

        ambientLightManager.start(cameraManager);
        inactivityTimer.onResume();
        characterSet = null;
    }

    @Override
    public void onPause() {
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        inactivityTimer.onPause();
        ambientLightManager.stop();
        cameraManager.closeDriver();
        if (!hasSurface) {
            SurfaceView surfaceView = this.surfaceView;
            SurfaceHolder surfaceHolder = surfaceView.getHolder();
            surfaceHolder.removeCallback(this);
        }
        super.onPause();
    }

    @Override
    public void onDestroy() {
        inactivityTimer.shutdown();
        //CameraConfigurationManager.isAlreadyInit=false;
        super.onDestroy();
    }

    public void restart() {
        restartPreviewAfterDelay(BULK_MODE_SCAN_DELAY_MS);
    }

    private void decodeOrStoreSavedBitmap(Result result) {
        // Bitmap isn't used yet -- will be used soon
        if (handler == null) {
            savedResultToShow = result;
        } else {
            if (result != null) {
                savedResultToShow = result;
            }
            if (savedResultToShow != null) {
                Message message = Message.obtain(handler,
                        IDS.id.decode_succeeded, savedResultToShow);
                handler.sendMessage(message);
            }
            savedResultToShow = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (holder == null) {
            Log.e(TAG,
                    "*** WARNING *** surfaceCreated() gave us a null surface!");
        }
        if (!hasSurface) {
            hasSurface = true;
            initCamera(holder);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        hasSurface = false;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {

    }

    /**
     * A valid barcode has been found, so give an indication of success and show
     * the results.
     *
     * @param rawResult   The contents of the barcode.
     * @param scaleFactor amount by which thumbnail was scaled
     * @param barcode     A greyscale bitmap of the camera data which was decoded.
     */
    public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) {
        inactivityTimer.onActivity();
        ScanResult resultHandler = ResultHandlerFactory.parseResult(rawResult);

        boolean fromLiveScan = barcode != null;
        if (fromLiveScan) {
            drawResultPoints(barcode, scaleFactor, rawResult);
        }

        handleDecodeInternally(resultHandler);

    }

    /**
     * Superimpose a line for 1D or dots for 2D to highlight the key features of
     * the barcode.
     *
     * @param barcode     A bitmap of the captured image.
     * @param scaleFactor amount by which thumbnail was scaled
     * @param rawResult   The decoded results which contains the points to draw.
     */
    private void drawResultPoints(Bitmap barcode, float scaleFactor,
                                  Result rawResult) {
        ResultPoint[] points = rawResult.getResultPoints();
        if (points != null && points.length > 0) {
            Canvas canvas = new Canvas(barcode);
            Paint paint = new Paint();
            paint.setColor(Color.parseColor("#c099cc00"));
            if (points.length == 2) {
                paint.setStrokeWidth(4.0f);
                drawLine(canvas, paint, points[0], points[1], scaleFactor);
            } else if (points.length == 4
                    && (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult
                    .getBarcodeFormat() == BarcodeFormat.EAN_13)) {
                // Hacky special case -- draw two lines, for the barcode and
                // metadata
                drawLine(canvas, paint, points[0], points[1], scaleFactor);
                drawLine(canvas, paint, points[2], points[3], scaleFactor);
            } else {
                paint.setStrokeWidth(10.0f);
                for (ResultPoint point : points) {
                    canvas.drawPoint(scaleFactor * point.getX(), scaleFactor
                            * point.getY(), paint);
                }
            }
        }
    }

    private static void drawLine(Canvas canvas, Paint paint, ResultPoint a,
                                 ResultPoint b, float scaleFactor) {
        if (a != null && b != null) {
            canvas.drawLine(scaleFactor * a.getX(), scaleFactor * a.getY(),
                    scaleFactor * b.getX(), scaleFactor * b.getY(), paint);
        }
    }

    // Put up our own UI for how to handle the decoded contents.
    private void handleDecodeInternally(ScanResult resultHandler) {
        viewfinderView.setVisibility(View.GONE);
        if (this.resultHandler != null) {
            this.resultHandler.scanResult(resultHandler);
        }
    }

    private void initCamera(SurfaceHolder surfaceHolder) {
        if (surfaceHolder == null) {
            throw new IllegalStateException("No SurfaceHolder provided");
        }
        if (cameraManager.isOpen()) {
            Log.w(TAG,
                    "initCamera() while already open -- late SurfaceView callback?");
            return;
        }
        try {
            cameraManager.openDriver(surfaceHolder);
            // Creating the handler starts the preview, which can also throw a
            // RuntimeException.
            if (handler == null) {
                handler = new CaptureFragmentHandler(this, decodeFormats,
                        null, characterSet, cameraManager);
            }
            decodeOrStoreSavedBitmap(null);
        } catch (IOException ioe) {
            Log.w(TAG, ioe);
            displayFrameworkBugMessageAndExit();
        } catch (RuntimeException e) {
            // Barcode Scanner has seen crashes in the wild of this variety:
            // java.?lang.?RuntimeException: Fail to connect to camera service
            Log.w(TAG, "Unexpected error initializing camera", e);
            displayFrameworkBugMessageAndExit();
        }
    }

    private void displayFrameworkBugMessageAndExit() {
        AlertDialog.Builder builder = new AlertDialog.Builder(
                this.getActivity());
        builder.setTitle("QR code");
        builder.setMessage("Sorry, the Android camera encountered a problem. You may need to restart the device.");
        builder.setPositiveButton("OK", new FinishListener(this.getActivity()));
        builder.setOnCancelListener(new FinishListener(this.getActivity()));
        builder.show();
    }

    public void restartPreviewAfterDelay(long delayMS) {
        if (handler != null) {
            handler.sendEmptyMessageDelayed(IDS.id.restart_preview, delayMS);
        }
        resetStatusView();
    }

    private void resetStatusView() {
        viewfinderView.setVisibility(View.VISIBLE);
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();
    }

    public void setScanResultHandler(IScanResultHandler resultHandler) {
        this.resultHandler = resultHandler;
    }

}
